DE8001995U1 - Bearing body for a plain bearing with high thermal conductivity - Google Patents

Description

The innovation is based on a bearing body according to the preamble of claim 1.

Bearing bodies (mostly bearing shells) for plain bearings have so far mostly been made either from a copper alloy (e.g. bronze) or from steel or cast iron, and a layer of tin-white metal (mostly Sn / Pb / Sb alloy) has usually been poured onto polygons . Such processes as well as the products manufactured according to them are well known from the literature (e.g. Czochralski, Lagermetalle und their technological evaluation, Springer Berlin, 1920; W. Hilgers, Dependence of the bearing material properties in composite bearings on the support structure, VDI reports No. 248, 1975, S.149-158; H.Loewie, From the practice of slide bearing production, Goldschmidt informs 2/70, Nr.ll, p.25-26; W.Hilgers, Improvement of the bond strength of support bodies made of cast iron with bearing factories, Goldschmidt informs 3 / 74, No. 30, pp. 4-5) _t

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At low loads and comparatively low j temperatures, conventional bearing bodies of this type have generally proved their worth _t The adhesion between bronze and tin-white metal is excellent, that between iron alloys and tin-white metal is generally good * At the highest loads and consequently higher temperatures (120 ° C and more), however, the combination of copper alloy / tin-white metal has the unpleasant property that the layer of brittle and hard intermetallic compounds responsible for adhesion and bonding in the transition zone increases in thickness due to increased diffusion and therefore the bond through cracking and peeling endangered is. On the other hand, bearing shells made of iron alloys (steel, cast iron) are comparatively poor heat conductors, so that the load on the temperature side of the tin-white metal will soon be limited (high temperature gradient white metal surface / support body surface).

The invention has for its object to provide a simple process for producing a bearing body on the basis of white metal, which is the f for tin white metal maximum operating temperatures allows for high thermal conductivity and consequently high load capacity to exploit and thanks to a good bond between bearing i material and Stützkörpermäterial a long service life and high operational reliability guaranteed. j

This task is made possible by the characteristics of the j

Claim 1 solved. ;

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The invention is illustrated by the following * figures illustrated embodiments described *

It shows:

Fig. 1 is a perspective view of a bearing body for a radial bearing ^ half-shells,

2 shows a perspective illustration of a bearing body for a circular axial bearing segment,

3 shows a schematic section through the layer sequence of a bearing body.

In Fig. 1, a bearing body for a radial bearing half-shell is shown in perspective. The bearing body forming a radial bearing half-shell 1 is composed of a copper jacket 2 as the base body (support body), a cylindrical iron intermediate layer 3 and a likewise cylindrical white metal spout 4 as a cover layer, which forms the actual running surface facing the shaft. The iron intermediate layer 3 has a thickness of 15 to 150 μ , depending on the size of the bearing, while the white metal spout 4 is generally selected to be several mm thick. The intermediate layer 3 can also consist of a sequence of a layer of nickel and a layer of iron, the latter lying on the side of the white metal spout 4. Furthermore, the pure copper of the jacket 2 can be replaced by a copper alloy with a chromium and / or zirconium content.

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Pig. 2 shows the perspective view of a bearing body for a segment bearing * The axial bearing circular segment consists of a copper block 6 as a base body (support body ¹ )> a flat iron intermediate layer 7 and a flat infusion as a white metal cover layer 8. With regard to the thickness of the individual layers and variations the material composition is shown on the text under Pig. I referred *

In Fig. 3 a section through the layer sequence of an IQ bearing body is shown. The basic structure of the copper base body (2; S), iron ^ intermediate layer (3; 7) and white metal top layer (4; 8) as a running surface is self-explanatory.

The innovation makes it possible to significantly improve slide bearings based on tin-white hietall the heat dissipation via a base body (support body) made of copper or a copper alloy compared to iron alloys (Steel, cast iron) to increase the load capacity without operational embrittlement and premature Having to accept crack formation in the intermetallic bond zone between white metal and carrier metal. thanks to the firmly adhering iron intermediate layer between the bearing metal and the support body ensures a high level of operational reliability and a long service life is guaranteed even with high loads on the bearings.

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fee drawing list

1 = radial bearing cups

2 - copper jacket as an orbital body

3 - intermediate iron layer (cylindrical)

4 = White metal cast as a top layer

(cylindrical)

5 = axial bearing circle segment

6 = copper block as the base body

7 = iron intermediate layer (eh? N)

8 = white metal top layer (flat)

Claims (6)

141/79 DEVGMt ■ * f rs · f · μ 5 V " · ■ »? re Protection claims Bearing body for a plain bearing of high thermal conductivity, characterized in that it consists of a base body (2; 6) made of copper or a copper alloy with at least 70% copper, a thin intermediate layer (3 »7) made of iron and a cover layer (4; 8) White metal exists on the side facing the shaft. 2. Bearing body according to claim 1, characterized in that the intermediate layer (3; 7) made of iron has a thickness from 15 μ to 150 μu. 3. bearing body according to claim l _s, characterized in that it is formed in P-Tm of a cylindrical radial bearing half-shell (1) or an axial bearing circular segment (5). ¹ I. Bearing body according to claim 1, characterized in that the base body (2; 6) consists of copper. 5. Bearing body according to claim 1, characterized in that the base body (2; 6) consists of a copper alloy with 0.5 % chromium and 0.1 % zirconium. 6. Bearing body according to claim 1, characterized in that the cover layer (4; 8) made of white metal with 3 to Wt .- # antimony, 1 to 10 wt .- $ copper, max. 5 wt. 55 Lead, the remainder is tin,